Every child grows in their own way and at their own pace. But as a parent, it’s completely natural to wonder: is my child where they should be?
Whether you’re watching your baby discover their hands for the first time or marvelling at your preschooler’s non-stop questions, understanding the broad stages of child development can help you feel more confident, and more connected to what’s happening in your child’s world.
This guide walks through key developmental milestones from birth to five years, covering what many children are doing at each stage across four areas of development: physical, language, social-emotional, and cognitive. It’s warm, general information, not a diagnostic checklist.
If you ever have specific concerns about your child’s development, your GP or an early childhood health professional is always the right place to start.
Why Developmental Milestones Matter (and What They’re Not)
Milestones are general markers that help us understand the broad arc of how children grow. They’re drawn from decades of research into child development and are used by educators and health professionals as a shared language for talking about growth.
What they’re not is a rigid timeline. Children reach milestones in sequences, not on schedules. A child might be ahead in language and slower to walk, or vice versa, and both are completely normal. The goal isn’t to measure children against each other; it’s to understand the remarkable journey each child is on.
At Milestones Early Learning, our educators are trained to observe, document, and respond to each child’s individual development through our Lifelong Learning Curriculum. The milestones below reflect that same big-picture view.
Birth to 12 Months: A World of Discovery
The first year of life is one of the most rapid periods of growth a human being will ever experience. Newborns arrive with more capability than we often realise, and within twelve months, most babies have transformed into curious, social, mobile little people.
- Physical development: Most babies progress from having very limited head control at birth to sitting independently, pulling themselves up, and beginning to crawl or cruise along furniture by around 9-12 months. Rolling, reaching, and grasping objects are key milestones along the way.
- Language development: Babies communicate from day one, through cries, facial expressions, and very quickly, coos and babbles. By around 6 months many are responding to their name, and by 12 months most are saying a first word or two and using gestures like waving and pointing.
- Social and emotional development: Attachment is the big theme of the first year. Babies learn to recognise faces, respond to familiar voices, and by 6-8 months often show signs of stranger anxiety, a healthy sign that they’ve formed secure bonds.
- Cognitive development: Object permanence, understanding that things still exist even when out of sight, typically develops around 8-12 months. You’ll see it in action when your baby searches for a toy you’ve hidden.
How our educators support this stage
In our nursery and infant rooms, our educators focus on building secure, responsive relationships with every child, because safety and trust are the foundation everything else grows from. Sensory play, face-to-face interaction, and language-rich environments are central to how we support babies through this stage.
1 to 2 Years: On the Move and Finding Their Voice
Toddlerhood begins with a bang. The 12-24 month period is characterised by a surge in independence, mobility, and language, often all at once, which can be as exhausting as it is wonderful.
- Physical development: Most children take their first steps somewhere between 9 and 15 months. By 18-24 months, many are walking confidently, beginning to run, and exploring climbing. Fine motor skills are developing too - toddlers become increasingly interested in stacking, filling, and emptying containers.
- Language development: Vocabulary grows quickly in the second year. Many children say around 10-20 words by 18 months and begin to combine two words (“more milk,” “daddy go”) by around 24 months. Understanding often outpaces speaking - your toddler may comprehend far more than they can say.
- Social and emotional development: This is the age of “mine” and big feelings. Toddlers are starting to develop a sense of self and asserting their independence, which can bring big emotions and challenging behaviour. This is entirely developmentally appropriate, it’s not defiance, it’s growth.
- Cognitive development: Symbolic play emerges - pretending a banana is a phone, or feeding a stuffed animal. This is an early indicator of imagination and abstract thinking.
How our educators support this stage
Our toddler rooms are designed for safe exploration and independence. Educators scaffold language constantly, narrating play, expanding on what children say, and creating opportunities for back-and-forth communication. Routines provide predictability, which supports emotional regulation.
2 to 3 Years: Language Explodes and Play Gets Social
If the second year is about finding their voice, the third year is about using it, constantly. Most two-year-olds are in a period of rapid language acquisition, and social play is becoming much more interesting.
- Physical development: By age 3, most children can run, jump, kick a ball, and navigate stairs with increasing confidence. They’re also developing greater fine motor control, holding crayons, turning pages, and beginning to manage buttons or zips.
- Language development: Many children move from two-word phrases to short sentences between 2 and 3. By their third birthday, most are speaking in sentences of 3-4 words and strangers can generally understand them most of the time. Vocabulary can grow to several hundred words during this period.
- Social and emotional development: Parallel play - playing alongside other children rather than directly with them - is common at 2, and gradually shifts toward more cooperative play as children approach 3. Sharing is still genuinely hard at this age; it requires a level of perspective-taking that is still developing.
- Cognitive development: Children are beginning to understand categories, sequences, and simple concepts of time (“after lunch,” “tomorrow”). They’re also asking why - a lot. This questioning is a sign of growing curiosity and critical thinking.
How our educators support this stage
How our educators support this stage: Educators in our 2-3 year rooms create rich language environments, introduce group experiences, and support the development of emotional vocabulary. Helping children name and understand their feelings is a key part of our approach at this stage.
3 to 5 Years: Getting Ready for the Big World
The preschool years bring a remarkable leap in complexity - in thinking, in language, in play, and in social understanding. Children are beginning to form real friendships, to reason about the world, and to develop early literacy and numeracy skills.
- Physical development: By 4-5, most children are running, hopping, skipping, and throwing and catching with increasing accuracy. Fine motor skills continue to develop - children are drawing recognisable shapes, beginning to write their name, and using scissors with guidance.
- Language development: Most 4-5 year olds speak in complete sentences, can retell stories, and have a vocabulary of over 1,000 words. They’re beginning to understand the rules of language - grammar, narrative structure, and conversational back-and-forth.
- Social and emotional development: Friendship becomes genuinely important at this age. Children are developing empathy, negotiating in play, and beginning to understand other people’s perspectives. They’re also developing a stronger sense of identity and what makes them “them.”
- Cognitive development: Literacy and numeracy foundations are building - letter recognition, counting, sorting, and patterning. Imagination is sophisticated: children create elaborate pretend worlds and stories. They’re also beginning to understand rules and apply them in games.
How our educators support this stage
Our preschool and kindergarten programs are designed with school readiness in mind, not by drilling skills, but by building the thinking habits, communication skills, and social confidence children need to thrive. Our educators draw on the Early Years Learning Framework (EYLF) to intentionally support each child’s learning across all five outcomes.
Every Child Has Their Own Timeline
Reading through milestones can feel reassuring, or occasionally raise a question or two. If something in this guide has prompted a concern about your own child’s development, the most important thing to know is that early support makes a real difference. Your child’s educators are a great starting point for a conversation, as are your GP and your local child and family health nurse.
What we know for certain is that the early years matter enormously. The experiences children have between birth and five - the relationships they form, the environments they explore, the conversations they’re part of - lay the foundation for everything that comes next. Our educators at Milestones Early Learning are with your family every step of that journey.
Learn More About How We Support Your Child’s Development
Curious about how our programs support children at specific stages? Explore our approach to curriculum and learning or find your nearest Milestones centre to book a tour.